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lib: keep timestamp in easy handle

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Use `data->progress.now` as the timestamp of proecssing a transfer.
Update it on significant events and refrain from calling `curlx_now()`
in many places.

The problem this addresses is
a) calling curlx_now() has costs, depending on platform. Calling it
   every time results in 25% increase `./runtest` duration on macOS.
b) we used to pass a `struct curltime *` around to save on calls, but
   when some method directly use `curx_now()` and some use the passed
   pointer, the transfer experienes non-linear time. This results in
   timeline checks to report events in the wrong order.

By keeping a timestamp in the easy handle and updating it there, no
longer invoking `curlx_now()` in the "lower" methods, the transfer
can observer a steady clock progression.

Add documentation in docs/internals/TIME-KEEPING.md

Reported-by: Viktor Szakats
Fixes #19935
Closes #19961
This commit is contained in:
Stefan Eissing 2025-12-15 14:28:09 +01:00 • committed by Daniel Stenberg
parent 425a2aa1af
commit 2de22a00c7
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67 changed files with 598 additions and 458 deletions
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3
lib/multi_ev.h
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@ -55,7 +55,8 @@ CURLMcode Curl_multi_ev_assess_xfer(struct Curl_multi *multi,
struct Curl_easy *data);
/* Assess all easy handles on the list */
CURLMcode Curl_multi_ev_assess_xfer_bset(struct Curl_multi *multi,
struct uint32_bset *set);
struct uint32_bset *set,
struct curltime *pnow);
/* Assess the connection by getting its current pollset */
CURLMcode Curl_multi_ev_assess_conn(struct Curl_multi *multi,
struct Curl_easy *data,